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Debt and Credit Agreements - Narrative (Details) - USD ($) | Apr. 22, 2019 | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Revolving credit facility |  |  |
Debt Instrument [Line Items] |  |  |
Remaining borrowing capacity |  | $ 1,800,000,000 |
Line of credit |  | $ 0 |
6.51% weighted-average senior notes |  |  |
Debt Instrument [Line Items] |  |  |
Weighted average interest rate |  | 6.51% | 6.51%
Subsequent Event | Revolving credit facility |  |  |
Debt Instrument [Line Items] |  |  |
Borrowing base | $ 3,200,000,000 |  |
Remaining borrowing capacity | $ 1,500,000,000 |  |
Minimum | Subsequent Event | ABR Loans | Revolving credit facility |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread | 50.00% |  |
Minimum | Subsequent Event | LIBOR Loans | Revolving credit facility |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread | 112.50% |  |
Maximum | Subsequent Event | ABR Loans | Revolving credit facility |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread | 125.00% |  |
Maximum | Subsequent Event | LIBOR Loans | Revolving credit facility |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread | 175.00% |  |
Non Investment Grade | Minimum | Subsequent Event | Revolving credit facility |  |  |
Debt Instrument [Line Items] |  |  |
Commitment fee percent | 30.00% |  |
Non Investment Grade | Minimum | Subsequent Event | ABR Loans | Revolving credit facility |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread | 150.00% |  |
Non Investment Grade | Maximum | Subsequent Event | Revolving credit facility |  |  |
Debt Instrument [Line Items] |  |  |
Commitment fee percent | 42.50% |  |
Non Investment Grade | Maximum | Subsequent Event | ABR Loans | Revolving credit facility |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread | 225.00% |  |
Investment Grade | Minimum | Subsequent Event | Revolving credit facility |  |  |
Debt Instrument [Line Items] |  |  |
Commitment fee percent | 12.50% |  |
Investment Grade | Minimum | Subsequent Event | ABR Loans | Revolving credit facility |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread | 12.50% |  |
Investment Grade | Maximum | Subsequent Event | Revolving credit facility |  |  |
Debt Instrument [Line Items] |  |  |
Commitment fee percent | 27.50% |  |
Investment Grade | Maximum | Subsequent Event | ABR Loans | Revolving credit facility |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread | 75.00% |  |

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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used. + References No definition available. + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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